Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

39457 results found.

  1. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  2. IPN triangulation of GRB 220308A (long / very bright)
  3. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  4. IPN triangulation of GRB 220305B
  5. Fermi trigger No 668410535: Global MASTER-Net observations report
  6. GRB 220306B: Tautenburg observations
  7. GRB 220304A Fermi GBM detection
  8. GRB 220306B: Swift-BAT refined analysis
  9. GRB 220306B: AbAO optical observations, possible afterglow candidate
  10. GRB 220306B: BOOTES-1 optical upper limit
  11. GRB 220306B: Swift-XRT refined Analysis
  12. GRB 220306B: Fermi GBM observation
  13. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  14. GRB 220306B: Enhanced Swift-XRT position
  15. Swift GRB 220306B: Global MASTER-Net observations report
  16. GRB 220305A: Swift-BAT refined analysis
  17. GRB 220306B: Swift detection of a burst
  18. Fermi GBM Sub-Threshold Detection of GRB 220305A
  19. GRB 220305A: Swift-XRT refined Analysis
  20. Fermi GRB 220306A: Global MASTER-Net observations report
  21. GRB 220306A: Fermi GBM Final Real-time Localization
  22. Fermi GRB 220305A: Global MASTER-Net observations report
  23. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  24. GRB 220305A: Fermi GBM observation
  25. GRB 220305A: Enhanced Swift-XRT position
  26. Swift GRB 220305A: Global MASTER-Net observations report
  27. GRB 220305A: Swift-XRT observations
  28. GRB 220305A: Swift detection of a burst
  29. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  30. GRB 220302A: Swift/UVOT Upper Limits
  31. IceCube Alert 220304.74: Global MASTER-Net observations report
  32. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  33. Fermi GRB 220304A: Global MASTER-Net observations report
  34. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  35. GRB 220302A: Swift-XRT refined Analysis
  36. GRB 220304A: Fermi GBM Final Real-time Localization
  37. IceCube Alert 220303.75: Global MASTER-Net observations report
  38. GRB 220302A: BOOTES-5/JGT optical upper limit
  39. GRB 220302A: Enhanced Swift-XRT position
  40. GRB 220302A: Swift afterglow detection
  41. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  42. Swift GRB 220302A: Global MASTER-Net observations report
  43. GRB 220302A: Swift detection of a burst
  44. GRB 220228A: Fermi GBM observation
  45. GRB 220228A: Fermi-LAT detection
  46. GRB 220228A: Fermi GBM Final Localization
  47. Konus-Wind detection of GRB 220222A
  48. Fermi trigger No 667737010: Global MASTER-Net observations report
  49. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  50. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  51. IceCube Alert 220225.59: Global MASTER-Net observations report
  52. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  53. IPN triangulation of GRB 220222A
  54. GRB 220101A: The first example of a Petanova
  55. Konus-Wind observation of GRB 220219B
  56. GCN Circ.draft on GRB 220222A
  57. GRB 220219B: Swift-XRT observations
  58. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  59. Fermi GRB 220223A: Global MASTER-Net observations report
  60. GRB 220223A: Fermi GBM Final Real-time Localization
  61. Fermi GRB 220222B: Global MASTER-Net observations report
  62. GRB 220222B: Fermi GBM Final Real-time Localization
  63. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  64. GRB 220219B: Swift ToO observations
  65. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  66. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  67. Fermi GRB 220222A: Global MASTER-Net observations report
  68. GRB 220222A: Fermi GBM Final Real-time Localization
  69. ZTF22aabjpxh/AT2022cva: Assy optical observations
  70. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  71. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  72. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  73. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  74. IceCube Alert 220221.03: Global MASTER-Net observations report
  75. Konus-Wind observation of GRB 220219A
  76. IPN triangulation of GRB 220219A
  77. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  78. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  79. IceCube Alert 220220.60: Global MASTER-Net observations report
  80. Fermi trigger No 666962499: Global MASTER-Net observations report
  81. GRB 220218A: BOOTES-5/JGT optical upper limit
  82. GRB 220219A: AGILE/MCAL detection
  83. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  84. GRB 220219A: Fermi GBM Final Real-time Localization
  85. GRB 220218A: Swift detection of a burst
  86. Swift GRB220218.94: Global MASTER-Net observations report
  87. GRB 220211A: redshift lower limit estimating
  88. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  89. Konus-Wind detection of GRB 220209A
  90. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  91. Konus-Wind detection of GRB 220211A
  92. IPN triangulation of GRB 220209A
  93. ZTF22aaajecp: GIT optical follow-up observations
  94. GRB 211023A: evidence of supernova in LBT spectra
  95. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  96. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  97. ZTF22aaajecp/AT2022cmc: VLA radio detection
  98. GRB 220211A: Fermi GBM observation
  99. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  100. Fermi trigger No 666489765: Global MASTER-Net observations report

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov